The stand-off between anti-government protesters and Thai troops is escalating in Bangkok, as the government launched an aggressive push to clear 3,000 demonstrators from their fortified camp in the center of the city. “This is D-Day,” one soldier said. Troops are using armored vehicles to break through the protesters’ barricades, made of tires and bamboo, and firing tear gas ahead. The Red Shirts, as the protestors are known, have been enclosed in the encampment since Thursday, and have no plans to back down. "We're asking everybody to be ready for a crackdown," one protest leader said. They have been rallying against Prime Minister Abhisit Vejjajiva, who they say came to power illegitimately in 2008, since mid-March. The riots have so far claimed 68 lives and injured more than 1,700.